Signaling device



April 24, 1928. 1,667,172

W. SPARKS SIGNALING DEVICE Filed Dec. 27, 1922 Fiai Patented Apr. 24, 1928.

UNITED STATES PATENT OFFICE.

WILLIAM SPARKS, OF JACKSON, MICHIGAN, ASSIGNOR TO THE SPAR-KSWITHINGTON COMPANY, OF CLEVELAND, OHIO, A CDRPORATION OF OHIO.

SIGNALING DEVICE.

Application filed December 27, 1922.

This invention relates to certain new and useful improvements in signaling devices, and is closely related to my copending applications Serial No. 396,802, filed July 16, 1920, and Serial No. et93,et98, filed August 18, 1921.

The main object of the invention is the production of a signaling device of the motor-driven type, in which accurate adjustment to a substantially pie-determined extent is readily made, either to compenqate for wearv or to etl'ect the desired position of the diaphragm-actuated member with reference to the diaphragm to effect such vibration of the latter as will result in the production of a satisfactory signal for the purpose at hand.

Another object is the production of a device of the character described in which the parts are normally so held in any position of adjustment as to prevent rattling or chattering of the same under ordinary conditions of use.

Other objects and advantages relate to the details of construction of the apparatus and the parts thereof, all as will more fully ap pear from the following description, taken in connection with the accompanying draw ings, in which Figure 1 is a longitudinal sectional view of a device of my invention.

Figure 2 is an end view of the adjusting means.

Figure 3 is a sectional view on line 33, Figure 2.

The horn structuremay be of various form and character in so far as the ordinary elements thereof are concerned, including the amplifier -1-, the front diaphragm case section 2, the rear diaphragm ca e section 3 which, as shown, is of dished or cup-shaped form, the diaphragm 4-, the motor case 5 which as illustrated, is of U-shaped form with its threaded ends G and -7- penetrating and projecting through the base of the diaphragm section 3 and secured in place in any suitable way, as by the nuts illustrated.

The structure further involves the usual armature 8, armature shaft -9 journaled in the cross bar 10 of the U-shaped case and in the base of the diaphragm case section 3. This shaft is provided with a commutator 11 for sliding engage- Serial No. 609,333.

ment with the brushes -12- supported from the U-shaped case section.

The structure so far described is substantially that disclosed in the applications above referred to.

The specific features of the invention here reside, as, above stated, in the means for positioning and maintaining the armature shaft 9- in proper adjustment without possibility of rattling or chattering of the cam -13- against the diaphragm projection -14 during ordinary conditions when the structure is not operating. The arma ture shaft normally pressed rearwardly by means of a spring member 15 which bears against the forward end of the shaft and has its end portion mounted on the projecting end as by one of the side walls of the U-shaped case -5, and being held in position between the case section -8 and the adjusting nut 16.

For the purpose of effecting movement of the shaft S)- and for holding it tightly against the spring 15- there is provided a rear bearing consisting of an adjusting bar 17 which, as illustrated. has its main portion extending substantially parallel with the cross bar -l0 of the case and upon one side of the shaft 9 the cross bar -10- is provided with an opening or slot -18- for receiving the flange -l)- formed upon one end of the bar l7, such engagement of the parts preventing move ment of the bar -17 except in a direction toward and from the cross bar -10- and for the purpose of effecting such movement there is provided a threaded stud -20- positioned upon the opposite side of the shaft 9 from the opening -18*, such stud having a threaded engagement with the cross bar 10 and extending through the adjusting bar 17 and having its head in contact with said adjusting bar for moving the same toward the cross bar 10', when the stud is rotated in one direction or permitting movement of the adjusting bar -17- away from the cross bar -10 upon rotation of the stud 20 in the opposite direction, such latter movement being effected by a spring 21 mounted upon the stud 20 and positioned between the cross bar 10 and the adjusting bar 17.

At a point intermediate the flange 19- and the stud 20 the end of the armature shaft 9 comes into contact with the adjusting bar -17-. In operation this adjusting bar actuated and constructed as described in connection with the spring 15- holds the shaft 9 under tension in proper adjusted position. An oiling pad *22 may be mounted upon the end of the armature shaft 9-, desired. Preferably the surface of the head of the stud 20 that comes in contact with the outer surface of the adjusting bar lT is formed with aries of alternate i-shaped projections and required in the claims hereto appended.

I claim 1. An apparatus of the character de scribed comprising a case section, a shaft journaled in said case section, and means for adjusting said shaft comprising an adjusting bar at the rear of said case section and having aportion in contact with the end of said shaft, a flange on said adjusting bar engaged with the case section at one side of said shaft, a rotary adjusting mcmber engaged with the adjusting bar and having a threaded engagement with the case section on the side of said shaft opposite said flange,

anda spring interposed between the adjusting bar and the case section.

2. An apparatus of the character described comprising a case section, a shaft journaled in said case section, means for adjusting said shaft comprising an adjusting bar at the rear of said case section and having a portion in contact with the end of said shaft, a flange on said adjusting bar engaged with the case section at oneside of said shaft, a rotary adjusting member engaged with the adjusting bar and having a thread ed engagement with the case section on the sid of said shaft opposite said flange, a

'journaled in said case section, means for adjusting said shaft comprising an adjusting bar at the rear of said case section and having a portion in contact with the end of said shaft, a flange on said adjusting bar enga 'ed with the case section at one side of said shaft, a rotary adjusting member engaged with the adjusting bar and having a threaded engagement with the case section on the side of said shaft opposite said flange,

and a casing enclosing the case section, shaft and adjusting bar, and having an opening through which the rotary member extends to permit rotation of said rotary member without removing the casing.

An apparatus of "the character described comprising a case section, a shaft journaled in said case section, means for adjusting said shaft comprising an adjusting bar at the rear of said case section and having a portion in contact with the end of said shaft, a flange on said adjusting bar engaged with the case sectlon at one side of said shaft,

a rotaryadjusting member engaged with the adjusting bar and having a threaded engagement with the case section on the side of said shaft opposite said flange, a soring interposed between the adjusting bar and the case section, said rotary member formed with a series of teeth, means cooperating with said teeth for normally frictionally locking the "rotary member in any position of adjust ment while permitting a step by step movement of said rotary member to effect adjustment of said shaft, and a casing enclosin the case section, shaft and adjusting bar and having an opening through which the rotary member extends to permit rotation of said rotary member without removing the casing. In witness whereof I have hereunto set my hand thisSth day of December 1922. WILLIAM SPARKS. 

